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National Geologic Map Database

Geologic Unit: Clarks Spring

Usage:

Clarks Spring Member of Secret Spring Shale (NV*)


Geologic age:

Middle Cambrian (Lincolnian; Marjuman)*


Type section, locality, area and/or origin of name:

Type locality: especially good exposures of the member provided by roadcuts in upper New York Canyon, just north of Clarks Spring near head of southwesterly branch of New York Canyon, [along bdry. btw. NE/4 sec. 3 (unsurveyed), T. 18 N., R. 53 E., and SE/4 sec. 34 (unsurveyed), T. 19 N., R. 53 E., northwestern corner Pinto Summit 15-min quadrangle (1953 ed.)], Eureka mining district, Eureka Co., central NV (Nolan and others, 1956).


AAPG geologic province:

Great Basin province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).